87 911 Idling Problem
#1
87 911 Idling Problem
Need some help with a poor idling issue. I have a 87 911 that was stored over the winter with Sta-bil. I took the car out about 6 weeks ago with no issues. The car ran fine and was idling perfectly. I went to drive it yesterday and it sputtered when starting and backfired. It started up but will not idle. Once started, if I keep the revs up it runs fine, but stutters and spits if I let it go to idle position. I checked the idle control valve, idle position switch, vacuum lines, etc. but everything seems to be ok as far as voltage and resistance values listed in the service manual. It feels more like the injectors are blowing too much fuel and it is flooding itself. Any ideas?
#2
Addict
It always seems to be the ICV or a vacuum leak.
ICV is a simple swap for a known good or new.
Vacuum leak for me is a can of brake-kleen on the suspected locations.
Anyway, welcome to Rennlist. Post pictures ASAP
ICV is a simple swap for a known good or new.
Vacuum leak for me is a can of brake-kleen on the suspected locations.
Anyway, welcome to Rennlist. Post pictures ASAP
#5
Addict
Following Ed's advice is usually a good place to start.
I remember giving mine it's first bath and not being able to fire it up afterwards. New distributor cap and rotor and I was off to the races.
I remember giving mine it's first bath and not being able to fire it up afterwards. New distributor cap and rotor and I was off to the races.
#6
Thanks guys, I been running down things and found the problem. When it backfired it partially blew off the 90 elbow coming off of the AFM. It wasn't obvious and I couldn't see it, until I kept feeling around and found it. Whew. Running great now.
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#9
Rennlist Member
I'd still check ignition. Backfiring on a DME motor doesn't just happen. My guess is water was involved. Your problem sure seems succinct, and I can see it happening, but why did it backfire to begin with?
#10
Addict
I seem to remember, once upon a time, putting my intake back on and forgetting that very same hose. It ran, but ran like crap and would not idle.
Anyway,
#11
Rennlist Member
Are you thinking that the backfire preceded and caused the hose coming off? I was thinking the hose worked it's self loose and that caused the backfire. Once the hose is back on, no more backfiring.
I seem to remember, once upon a time, putting my intake back on and forgetting that very same hose. It ran, but ran like crap and would not idle.
Anyway,
I seem to remember, once upon a time, putting my intake back on and forgetting that very same hose. It ran, but ran like crap and would not idle.
Anyway,